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https://issues.apache.org/jira/browse/CALCITE-826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651763#comment-14651763
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Jesus Camacho Rodriguez commented on CALCITE-826:
-------------------------------------------------

[~julianhyde], this is an issue that we were hitting in the Hive test run; as 
the Project operators were not created with a factory we were hitting the 
assertion in L394 in RelFieldTrimmer. I have created a pull request for the 
fix. Can I push it to master? 

> Use ProjectFactory in RelOptUtil.pushDownJoinConditions
> -------------------------------------------------------
>
>                 Key: CALCITE-826
>                 URL: https://issues.apache.org/jira/browse/CALCITE-826
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>             Fix For: 1.4.0-incubating
>
>
> RelOptUtil.pushDownJoinConditions is called in FilterJoinRule; it might 
> create Project operators, but a ProjectFactory parameter is not provided. 



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